16-mm sound motion pictures : a manual for the professional and the amateur (1953)

Record Details:

Title:
16-mm sound motion pictures : a manual for the professional and the amateur
Date:
1953
Publisher:
New York : Interscience Publishers
Volume:
16-mm sound motion pictures : a manual for the professional and the amateur
Leaf #:
000263
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
April 11, 2024
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OPTICAL SYSTEM 247 Direction of motion ^_^ Recording Fig. 59. Bilateral variable-area sound track — unbiased negative and print. Vertical motion of the triangular recording light beam across the slit provides modulation of the track. ./Printer / light Scanning w' reproducing light modulator at 12,000 cps (Fig. 58) ; for most purposes (such as for recording within range F or for ranges of more limited fidelity), the light modulator characteristics may be considered quite flat in the working range. Modulators made by other manufacturers, such as RCA and Western Electric, are also flat within range F ; however, the tuning point, its amplitude, and the " sharpness' ' of tuning are all somewhat different, reflecting the different compromises of the designers. The Optical System The early optical systems for variable-area recording were designed to provide a sound negative of the unilateral unbiased type such as that shown in Figure 31. In the search for better fidelity, it was found that the unilateral form of sound track was not the most advantageous with regard to noise and distortion; better results were obtained with the z^v- Lamp mage of illuminated portion of slit mage of window in mask -\ _ Window lens Galvanometer mirror „Electrical terminals Latent imagp of sounc| Screen Slit in screen Axis of rotation of mirror Dry galvanometer Drum Objective lens Fig. 60. General arrangement of typical optical system for producing bilateral variable-area sound track.